The Immortality Cure

The Immortality Cure It is a potion created by the witch Qetsiyah to reverse immortality. When used on immortal beings, they are reverted to their mortal states and are thus vulnerable to death. The cure when ingested by a doppelgänger converts the blood of the given doppelgänger, causing it to become a liable candidate for a single dose if ingested and if the doppelgänger in question had lived beyond human years, the post-cure effects would begin to cause him/her to age and eventually die.